260. In the designof a junction transistor, it is desirable that
A. the mobility of the minority carriers in the base region be as high as possible
B. the diffusion length of the minority carriers in the base region be as short as possible
C. IcBo be as high as possible
D. the base region be more heavily doped than the emitter region

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261. The arrowhead on the transistor symbol always
A. points in the direction of electron flow in the emitter region
B. points in the direction of hole flow in the emitter region
C. points in the direction of majoritycarrier flow in the emitter region
D. points in the direction of minority carrier flow in the emitter region

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262. The external-circuit current of a normally biased junction transistor
A. is due to the flow of holes in the external circuit for the p-n-p transistor and the flow of electrons for the n-p-n transistor
B. is due to the flow of electrons in the external circuit for the p-n-p transistor and the flow of holes for the n-p-n transistor
C. flows in the same direction for both the p-n-p and n-p-n transistors
D. flows in opposite direction for the p-n-p transistors, respectively

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263.  The common-base-output-volt-ampere characteristics may be shown by plots of
A. VcB versus Ic for constant values of IE
B. VcB versus IB for constant values of IE
C. VcE versus IE for constant values of IB
D. VcE versus lc for constant values of 'BE

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264. The common-base-input-volt-ampere characteristics may be shown by plots of
A. VcB versus Ic for constant values of IE
B. VCE versus IB for constant values of IE
C. VEB versus IE for constant values of VcB
D. VEB versus IB for constant values of VcB

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265. A transistor-terminal current is considered positive if of VEB
A. electrons flow out of the transistor at the terminal
B. electrons flow into the transistor at the terminal
C. current is due to the flow of electrons only
D. current is due to the flow of holes only

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266. A transistor-terminal voltage is considered positive if
A. the terminal is connected to p-type material
B. the terminal is more positive than the common terminal
C. the terminal is the output terminal
D. the terminal is more negative than the common terminal

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